Core-barrel connection



June 30, 1925.

A. J. NIGHTINGALE CORE BARREL CONNECTION Filed Jung 26, 1922 WNW 7 |||l\\\ ff 'una 1f v N v a@ --3- [y Il /f @null lijven 01".,

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Patented June 30, 1925.

UNITED STATES .NDREW J. NIGHTINGALE, 0F HUNTINGTON BEACH, CALIFORN'IAa conn-BARREL CONNECTION.

Application filed June 26, 1,922. Serial No. 570,812.

To all whom it may concern.'

Be it known that I, ANDREW J. NIGHTIN- GALE, a citizen of the United States, and a resident of Huntington Beach, county of Orange, and State of California, have invented a new and useful Core-Barrel Connection, of which the following is a specilication.

The present invention relates to improvements 1n core barrel connections and has particular reference to means for taking samples in drillin wells. To take samples of the character escribed it is customary to use a barrel at the end-of a hollow shaft, which latter is rotated so that the barrel .works itself into the earth and its interior is filled with the earth material of the stratum in which it is worked. When the shaft and the barrel arev pulled upward this earth adheres to the barrel and gives information to the operator as to the soil formation atv the bottom of the well. The rincipal object of the present invention 1s to provide means between the hollow shaft andthe hollow bit that will allow water to be forced through the hollow shaft for washing out the mud without interfering with the forming of the sample core within the barrel.

With this object in view I have shown the preferred form of my invention in the accompanying drawing in which Figure 1 represents a side elevation of my connecting link, the hollow shaft and the core barrel, Figure 2, a vertical section through the same along line 2-2 of Figure 3; Figure 3l a horizontal cross section alon line 3-3 of Figure 2; Figure 4 a vertica section taken at right angles to that of Figure 2, and Figure 5 a horizontal cross section along line 5-5 of Figure 4. While I have shown only the preferred form of the invention I wish to have it understood that various changes or modifications may be made within the scope of the claims hereto attached without departing from the spirit of the invention. The shaft (1) of which only a part is shown in the drawing re resents the working shaft of a rotarydri l and ma be rotated by any suitab e means not s own in the drawing. It is hollow as shown in Figures (2) and (4). The barrel (2) provided with teeth (5) at its bottom is of the same dlmensions as the hollow shaft (1) and is provided at its upper end with a reduced` externally threade extensionv y(3) adapted t0 reeelve the lnternally threaded bottom end (4) of my connection (6).. The latter consists of a plug (7) having a solid central portion (8), an upper bore (9) adapted to register with the bore (11) in the hollow shaft and the lower bore (12) re istering with the bore (13) inthe barrel 2). Anexternally threaded reduced end (14) of the plug is adapted .to engage the internally side of the plug, the two pairs of communications being preferably arranged at right angles to each other and all the communications preferably landing at the circumference of the plug in substantially the same horizontal plane. The communications, especially from the lower bore preferably terminate in peripheral recesses (18).

In operation water is forced downwardly through the hollow shaft (11) and is allowed to enter the hole. that is being drilled through the downwardly extending communications (16 It mixes with the earth in which the dr1ll works and enters the inside of the barrel together with the earth that is being loosened. Beinff lighter than the earth it is forced upwardlby gravitation and as the barrel fills with earth is forced outward again through the communications (17) allowing some of the heavier mud that is carried along by the water to settle around the opening and to thereby prevent the water from washing out the contents of the barrel in case the substance contained therein consists of loose sand or similar material which would readily yield to the water when being lifted.

I claim: f

A core barrel connection. comprising a plug having a solid conter portion, a bore at either end, peripherial recesses in the outside of the plug substantially midway bctWeen 4the bottom ends of the bores, ownwardly slanting communications between the upper bore and the outside of the plug and upwardly slanting communications between the lower bore and the outside of the plu all the communications being disposed to discharge into the recesses at the lsame elevation.

ANDREW J. NIGHTINGLE. 

